Mac Mail App Keeps Crashing. The app consistently crashes when i delete the messages in the “junk” mail folder. Now, move the files to your desktop and try to open the mail app.

Mostly, the problem with mail app crashes can be fixed by keep updating the mail app from windows store. You can restart your mac by going to the apple menu > restart. Please try each step below one at a time.
Also, any idea why trying to reset my nvram doesn't working either?
You try and launch the mail app on your macbook with macos catalina, but it crashes every time. This article will help you if: If this doesn’t do the trick, the next step to try is to force the mail app to start over. Start date wednesday at 11:26 am;